Henry kolle



@uiten tetes gatrat @Hire HENRY-ROLLE, OF BOSTON, MASSACHUSETTS.

Letters Patent No. 60,742, dated July 16, 1867.

IMPRGVED PRUPELLER.

@In Silente ttfatiy it in tlgtst tettets @dem mit mating pmt nf tige sima( TO ALL TO'WHOM THESE PRESENTS SHALL OME:

Be it known that I, HENRY ROLLE, of Boston, in the county of Suffolk, and Commonwealth of Massachusetts, have invented an Improved Propeller for Steamships, Sto.; and' do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification, and in whch--A Figure 1 is a plan.

Figure 2, a side elevation and Figure 3, an end elevation of my invention.

The object of the invention is to construct in a strong and simple manner a propeller for navigable vessels, by whichall back pressure or weight of the water is avoided, and thus gain the full amount of propelling power of which a water motor is susceptible.

The invention consists in one or more series of vertical paddles or blades, fixed to horizont-al bars, supported by cranks upon each side of the vessel, and operated by cranks, so arranged as to cause reciprocating movements of the paddles in an elliptical or oblong path, essentiallyas hereinafter explained. i

In the accompanying drawings, A B denote two horizontal shafts properly supported, extendingthrough the side of a vessel, and having a crank, F or F','formed upon their inner ends, these twe cranks F F' being connected by a parallel rod, C. The cuter ends of the shafts A. B are formed into doublethrow-cranks D or D', the wrist-s a a a' a' of these cranks being'in the vsame vertical plane,.and connected together by parallel lhorizontal rods o o'. Each of these parallel rods b 6 hasla series of paddles or blades, c e c e or e' e c', adixed to and pendent from them, as shown in iig. 2 of the drawings, the' number of these oats being increased or diminished as maybe determined to be best. The two shafts B, with their-cranks, connecting-rods, and paddles, arranged as described, are to be applied to each side of the vessel, as is the case with .the ordinary paddlewheel. The cranks -F or F are disposed upon the-shafts A B,- quartering,as it is termed, and well understood by engineers, the object beingto carry the cranks D D and D' D' by their dead-centres. 'lhe'revolutions o f the shafts A and B cause the seriesof blades c c c or c' 'c' c. to dip into the water in nearly a vertical line, until immersed therein, and then to describe a. nearly horizontal direction for about one-quarter of arrevolution of such cranks', and subsequently to rise out of the water in the same direction with which they entered it, and this whether the vessel be advancing or backing water. i

l't `will be seen by. the above description that, as before stated, there is no backpressure or 'weight of water upon the tioats as they rise out of the water; and, Further, owing to the line of movement. described by the iioatswhile in the water and propelling the vessel, that is nearly in a horizontal movement for some distance, much more power is obtained than if the floats described a circular movement. The accompanying drawings represent two series of cranks, rods, and propelling-blades on onesde of the vessel; the number of these may be increased, if found necessary or desirable in practice, but one series to a side will probably be foundpreferable. The inner cranks F F' are to be suitably connected to the main driving-shaftof the vessel.

The inventionis strong, durable, and effective in operation, and cheap of construction, and it isrbelieved will be of great public utility. It 4will need little or no watersgard over it,rand can be applied to small boatsl to good advantage, as the water is not thrown or scattered about by it. l

I claim the combination with the blades c and bars b of the long and .short-armed double cranks D D', and cranks F F', the whole being arranged for operation as and for the purposes set forth.

HENRY ROLLE.

Witnesses:

HENRY S. Coon, Guss. H. GRIrrIN. 

